2e) Margaret, Css of Flanders
and Hainaut (1202-10 Feb 1280); m.1st
before 23 Jul 1212 (div ca 1221) Bouchard d'Avesnes; for the descendants of
this marriage see Part 3; she m.2nd 1223 Guillaume de Dampierre (d.3
Sep 1231); for the descendants of this marriage see Parts 4 and 5